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What is the difference between AFI and GFI circuit breakers?

The AFI is a UL listed circuit breaker designed to mitigate the effects of arcing faults. It is required by UL to protect against arcs between current carrying conductors above 75A (Square D AFI protects from arcs above 50A), and may trip on leakage to ground with a minimum threshold of 30 to 50 mA.

The GFI is a circuit breaker UL listed for interrupting the circuit when more than 6mA of ground-fault leakage is detected.